GM 20757670 Blade Kit, Engine Cooling Fan

These models are equipped with two Radiator Fans mounted side-by-side behind the radiator. The PCM (Powertrain Control Module-engine computer) and three relays are used to operate the fans at low or high speeds depending on engine needs and other conditions. The fans are protected by fuses inside the engine compartment's fuse/relay box. If the engine is overheating and neither of the Radiator Fans operate, check each fan by unplugging the fan motor electrical connector and applying battery power directly to the motor terminals with fused jumper wires. When done correctly, the fan should come on. If a fan motor doesn't work, replace the motor. If the fan motors are okay but are still not coming on when the engine gets hot, the fan relays might be defective. Locate the relays in the engine compartment's fuse/relay box. You can pull each relay out and test them individually. Locate the fuses in the engine compartment fuse/relay box. Remove the fuse and check the fuses for continuity. If the fuses are okay, check all wiring and connections to the fan motors. If no obvious problems are found, have the Radiator Fan system and circuit diagnosed by a dealer service department or repair shop with the proper diagnostic equipment. Drain the cooling system. If the coolant is relatively new and still in good condition, it can be saved and reused. On four-cylinder engine models, there is an additional drain plug on the bottom of the water pump. Be careful to clean up any spilled coolant. If you're working on a 2005 or 2006 model, have the air conditioning system discharged at a qualified service center. Remove the air filter assembly duct, upper radiator air baffle, disconnect the transmission cooler lines from the radiator, support the condenser by tying it to the radiator support, raise the vehicle and support it securely on jackstands, remove the upper radiator brackets, pry the fan shroud mounting tabs out of their clips, remove the lower radiator air baffle, disconnect both radiator hoses from the radiator, remove the air conditioning hoses. On four-cylinder engine models, unclip the transaxle cooler lines from the fan shroud. On all other engine models, disconnect the transaxle cooler lines from the radiator. Support the air conditioning condenser by tying it to the radiator support. Remove the upper radiator mounting brackets, pry the fan shroud upper mounting tabs upwards out of the retainers on the radiator, remove the fasteners for the engine splash shield and the air deflectors on each side and then remove them. On V6 engine models, remove the right fender splash shield. Remove the radiator hoses from the radiator. Remove the drive belt. Disconnect the fan motor harness electrical connectors. Remove the lower radiator mounting brackets. Remove the transaxle oil cooler lines from the radiator and transaxle. Make sure that no other wiring harnesses, hoses, or anything else is attached to the fan shroud and that it is clear for removal. Carefully tilt the bottom end of the radiator and fan shroud forward and remove the fan shroud from the bottom while supporting the radiator. Installation is the reverse of removal. Tighten all fasteners. Refill the cooling system with the proper concentration of antifreeze and check the transaxle fluid level.